Burglar-alarm



J. KRUG AND S. SCHERMANN.

BURGLAR ALARM.

APPLICATION FILED JAN. 2. 1919.

73 wmm/tow 2 SHEETSSHEET I- MWWLV 'rm. COLUMIHA PLANOGRAPH c0, WASHINGTON. n. C.

J. KRUG AND S. SCHERMANN.

BURGLAR ALARM.

APPLICATION FILED JAN. 2. I919.

1 309,529. Patented July 8, 1919.

2 SHEETS-SHEET, 2.

V /f A? 2 22 /3 /2 /7 wumtow JULIUS KRUG AND STEFANS SCI'IERMANN, OF ST. LOUIS, MISSOURI.

BURGLAR-ALARM.

eoasas.

Specification of Letters Patent.

Patented July 8, 1919.

Application filed January 2, 1919. Serial No. 269,221.

To all whom it may concern:

Be it known that we, JULIUS Kane and STEFANS Sonnnamnn, citizens of the United States, residing at St. Louis, State of Missouri, have invented certain new and useful Improvements in Burglar-Alarms; and we do declare the following to be a full, clear, and exact description of the invention, such as Will enable others skilled in the art to which it appertains to make and use the same.

Our invention has for its object to provide a simple and comparatively inexpensive yet highly efficient and reliable device for firing a cartridge to give Warning when a door or window to which said device is attached, is opened by an unauthorized party, the report from the cartridge serving not only to warn the occupants of the building, but to so frighten the intruder as to cause him to leave the premises.

With the foregoing in view, the invention resides in the novel features of construction and unique association of parts hereinafter fully described and claimed, reference being made to the accompanying drawings.

Figure 1 is an inner side view of a portion of a door and its frame, showing the invention applied thereto and set for operation.

Fig. 2 is a view similar to Fig. 1, illustrating the manner in which the device may be locked against operation, so that the door may be opened by authorized persons.

Fig. 3 is a side elevation showing the manner in which the cartridge is fired when the door is opened by a burglar or other unauthorized person.

Figs. 4 and 5 are vertical sections on the planes indicated by the lines fir-"4: and 55 of Figs. 1 and 3, respectively.

Figs. 6 and 7 are detail horizontal sections on the planes designated by the lines 6-6 and 77 of Fig. 1.

Fig. 8 is a perspective view of the attach ing plate.

Fig. 9 is a perspective of the slide and the firing pin carried thereby.

In the drawings above briefly described, an attaching plate is shown consisting of a ver tically elongated, relatively narrow portion 1 and a wider horizontal portion 2 extending from said vertical portion, the free ends of said vertical and horizontal portions having openings to receive screws or other fasteners 3 by means of which the plate is attached to a door D, or in some cases to a window. Near its upper end the vertical poition 1 of the attaching plate is provided with a forwardly extending lug :4; having a guide opening 5 for the firing pin yet to be described, while the lower end of said portion is equipped with a similar lug (3 having an opening 7 to receive a blank cartridge 8, the latter being thus held in position to be fired by the aforesaid pin.

A vertically disposed slide bar 9 contacts with the front end of the lug 4 and is provided with a vertical slot 10 receiving a headed stud 11 which projects from said lug, the lower end of said slide bar being equipped with a rearwardly projecting lug 12 contacting slidably with the attaching plate and having a headed stud 13 which is slidably received in a vertical slot 14: formed in the vertica portion 1 of the aforesaid plate. The side walls of the slot 14 are preferably rabbeted or undercut to accommodate the head of the stud 13 as seen in Fig. 7 The lug 12 is provided with an opening 15 vertically alined with the openings 5 and 7, and a vertical firing pin 16 is secured in said opening 15, while its upper end passes slidably through the opening 5. The lower end of pin 16 is pointed at 17 to properly strike the cartridge 8 and in order that said pin may be laterally adjusted for proper contact with the cartridge, it is preferably of a diameter smaller than the opening 15 and is held in the latter by opposed setscrews 18 which are threaded in the lug 12. A coiled spring 19 surrounds the firing pin 16 between the lugs 12 and l and it will thus be seen that when the slide bar 9 is raised and held in a raised position, the spring will remain tensioned to force said bar and the firing pin downwardly, to fire the cartridge 8, when said bar is released.

For retaining the slide bar 9 in a raised position, we preferably provide its upper end with a forwardly extending lug 20 which rests upon a pin or lug 21 projecting from the door frame. The slide bar 5) is raised by means of a suitable handle while the take place when the door is opened by an unauthorized person, and in order that any persons who may legitimately open the same,

may not cause firing of the cartridge, we mount a lock 23 upon the horizontal part 2 of the attaching plate, in such manner as to allow the bolt 24 of said lock to be projected beneath the lug 12 when raised, by means of a key insertible into the lock from either side of the door. By this arrrangement, even though the device has been left in posi tion set for operation as seen in Fig. 1, an authorized person may open the door from either side without operating the device, by inserting the key and projecting the lock bolt beneath the lug 12 as depicted in Fig. 2. If an unauthorized person opens the door, however, the spring 19 operates the slide bar and firing pin to fire the cartridge 8 as above specified.

From the foregoing, taken in connection with the accompanying drawings, it will be seen that although our invention is of comparatively simple and inexpensive nature it will be highly efiicient and reliable. Since probably the best results are obtained from the details shown and described, they may well be followed, but with in the scope of the invention as claimed, considerable latitude is allowed for making such minor changes as occasion may dictate.

What we claim is:

1. In an alarm for doors and windows, an attaching member, means carried by said member for holding a cartridge, a firing pin mounted slidably and non-rotatably on said attaching member for firing the cartridge, a spring for operating said pinja lateral lug movable bodily with said pin along a straight path, and a stop adapted to be carriedby a relatively movable part to engage said lugand prevent operation of said firing pin until the door or window is opened.

2. A structure as specified in claim 1, together with a lock operable either from the interior or exterior of the building and capa'ble of holding said firing pin against opmentioned lug through the slot of said slide bar, a lug on said slide. bar contacting with the slotted part of said plate and having a headed stud received in the slot thereof, a firing pin passing slidably through the aforesaid lug of said attaching plate and secured to the lug of said slide bar, with one of its ends positioned adjacent the other lug of said attaching plate, said last named lug having means for holding a cartridge, a coiled spring for operating said firing pin and slide bar to fire the. cartridge, an additional lug on said slide bar extending oppo sitely from the aforesaid lug thereof, and a stop adapted to be secured to a fixed part to cooperate with said additional lug and prevent operation of said slide. bar and firing pin under normal conditions.

4;. Astructure as specified in claim 3,, said firing pin passing loosely through an open ing in the first named lug of said slide bar, and opposed setscrews threaded in said lug for adjusting said pin to properly strike the cartridge and for holding it in adjusted position.

5. A structure as specified in claim 3, together with a lock secured tosaid attaching plate at one side of said slide bar, said lock having a bolt capable of projecting b,eneath the first named lug of said slide bar to prevent actuation of the latter when said additional lug and said stop are disengaged.

In testimony whereof wehave hereunto. set

our hands.

JULIUS KRUG. STEFANS SCHERMANN.

Copies of this patent may he obtained. for five cents each, by addressing the Commissioner 01 Patents,

Washington, D. G. i i 

